VulnSocial

CVE-2026-8406Disclosure

LOWCVSS 7.1 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

openSIS Classic 9.3 contains an insecure direct object reference vulnerability in the messaging module. Any authenticated user with access to the messaging module can request sent-message details from modules/messaging/SentMail.php by supplying an arbitrary mail_id value.

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0.0/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-639

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

STABLE

Threat summary

  • 2 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Technical details provided in 1 signal
  • Disclosure: 2 classified signals
  • Peaked 1d ago at 1 mentions (2026-06-11); latest day: 1
  • 2 total mentions across 2 days

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-06-11: 1Mentions · 2026-07-28: 1Technical Details · 2026-06-11: 106-1107-28
Signal classification1 categories
Disclosure
2100.0%
Referenced assets3 URLs
Full discourse2 posts
  • Fluid Attacks@fluidattacks
    Disclosure

    A zero-day vulnerability in openSIS Classic was discovered by an external pentester, then reviewed and documented by Fluid Attacks: ID CVE-2026-8406. You can find the full details here: 🔗 https://fluidattacks.com/advisories/melanie. We have disclosed 261 #CVE to this date: 🔗https://fluidattacks.com/advisories https://t.co/JENShdoQXj

    Post summary

    Fluid Attacks disclosed a zero‑day vulnerability in openSIS Classic (CVE‑2026‑8406) and provided a link to an advisory for further details.

    00000120
    884 followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-8406 openSIS Classic 9.3 contains an insecure direct object reference vulnerability in the messaging module. Any authenticated user with access to the messaging module can r… https://www.cve.org/CVERecord?id=CVE-2026-8406

    Post summary

    CVE-2026-8406 is an IDOR vulnerability in openSIS Classic 9.3’s messaging module that could allow any authenticated user with access to that module to perform unauthorized actions. No PoC, exploit code, active exploitation, or patch details are provided in the text.

    00000121
    57.6K followersView on X

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